This puzzle is a dandy

[cisco]

Click on the link.
Follow instructions, then click on the little boy in the lower right hand corner.

http://digicc.com/fido

:shrug:

 

[Snake Plissken]

That was weird

OK where are the math experts that can explain this one?

 

[Nole]

Cool!

nole

 

[Chanman]

 

[dawgball]

I did this twice. When you subtract the numbers to get your final number, all of the digits added together equalled 18. When you take one out, you just subtract the rest from 18 to get your answer.

Don't know why it comes to this, but it is what I noticed after two trials.

 

[dawgball]

If the numbers added together are less than 9, then you would use 9 instead of 18.

 

[KotysDad]

Dawgball pretty much hit the nail in the head. When you do your subtraction you will get the numbers summing to either 9, 18, or 27.

When you type in your numbers, the program just adds whatever it takes to get up to 9, 18, or 27 (whichever it is smaller than).

The reason it tells you to not circle 0 is because it could leave you with two numbers that add to 9 or 18 and it isnt automatically obvious whether you circled a 0 or a 9 at that point, so the computer eliminates that possibility.

Thats a cool trick. I never saw that one before.